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It was first FAT32, then i formated it to Journal, but nothing changed.

Can you tell me which exact brand and model USB drive you have? And can you try it on another computer? If it's a Windows computer, reformat it to FAT32. In fact, in Disk Utility, delete the partition entirely and start over.

If that doesn't work, then for kicks, try resetting the PRAM. It cleared up a memory problem someone else was having, and one I didn't know I was even having. A lot of information is stored there, and I'm wondering if Lion upgrades have somehow corrupted the data there. Let us know how any of this works out.Resetting your Mac's PRAM and NVRAM